body,p,h1,h2,h3,h4,h5,h6,ul,ol,li,dl,dt,dd,input{
    margin: 0;
    padding: 0;
}
body{
    min-width: 1200px;
}
ol,ul,li{
    list-style: none;
}
a{
    text-decoration: none;
    color: #333;
}
img{
    display: block;
}
.header{
    width: 1200px;
    margin: 20px auto;
    height: 80px;
    display: flex;
    align-items: center;
}
.logo_box{
    width: 100px;
    height: 100px;
    margin:10px 40px 5px 0;
}
.logo{
    width: 100%;
    height: 100%;
}
.greet{
    margin-left: 20px;
    font-size: 30px;
    color: #747474;
}
.content{
    width: 100%;
    height: 430px;
    margin: 0 auto;
    background: url('https://ecuniplatform-static.helenarubinstein.cn/medias/%E5%93%81%E7%89%8C%E6%95%85%E4%BA%8BPC_12_a198632dc6344fab81a45f137ff7d156/%E5%93%81%E7%89%8C%E6%95%85%E4%BA%8BPC_12.jpg')top center;
    position: relative;
}
.login_wrap{
    width: 500px;
    height: 300px;
    background-color: #fff;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 290px;
    display: flex;
    flex-direction: column;
}
.cut{
    display: flex;
    justify-content: space-evenly;
    align-items: center;
    height:40px;
    width: 100%;
}
.cut>li{
    flex: 1;
    text-align: center;
    font-size: 26px;
}
.cut>li.active{
    background-color: skyblue;
}
.show_box{
    flex: 1;
    position:relative;
    width: 100%;
    height: 100%;
}
.show_box>li{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    display: none;
}
.show_box>li.active{
    display: flex;
}
.login,.register{
    padding-left:30px;
    padding-top: 20px;
    position: relative;
}
.hint,.error{
    display: none;
    font-size:22px;
    margin-bottom: 10px;
    color: red;
    padding-left: 20px;
    position: absolute;
    left:50px;
    top: 5px;
}
.hint.active,.error.active{
    display: block;
}
.login>form{
    margin-top: 30px;
}
.login>form>div{
    width: 300px;
    height: 40px;
    margin-bottom: 20px;
    font-size: 18px;
    margin-right: 5px;
}   
.login>form>div>input{
    outline: none;
    border: 1px solid #333;
    margin: 0 auto;
    font-size: 16px;
    height: 25px;
    padding-left:10px;

}
.login>form>button{
    width: 400px;
    height: 40px;
    font-size: 24px;
    margin-left: 20px;
}
.register>form{
    margin-top: 20px;
    display: flex;
    flex-direction: column;
}
.register>form>div{
    width: 300px;
    height: 30px;
    margin-bottom: 10px;
    font-size:18px;
    margin-right: 5px;
}
.register>form>div>input{
    outline: none;
    border: 1px solid #333;
    margin: 0 auto;
    font-size: 16px;
    height: 25px;
    padding-left:10px;
}
.register>form>button{
    width: 400px;
    height: 40px;
    font-size: 24px;
    margin-left:20px;
    padding:0;
}
